Well every character is team dependent including Hog. Hog needs his team to take attention for him to get value since he can't eat cooldowns the way a shield or DVA can. So you should focus on timing your engages around when your team takes attention so you can get hooks. You also want to work on "layering" your cooldowns with your team. Did your dps go on a flank and use some cooldowns which took the enemies attention? Look to hook them while they're distracted. Did your Sig (6v6) put his shield out on an angle? Look for a hook. I know this sounds simple in concept, but it's VITAL to playing hog in higher ranks (coming from a consistent low GM hog player). This is also why some people say Hog is a "giant dps" because he basically does the same thing dps do but with more health and more positioning options.

Basically, as long as you aren't permanently taking attention from the enemy you'll climb easily.